PMID: 4986901Feb 1, 1968Paper

Mechanism of enhancement of virus plaques by cationic polymers

Journal of Virology
C Wallis, J L Melnick


It has been assumed that plaque enhancement by cationic polymers is due to their binding of sulfated polysaccharides in agar. However, viruses that are enhanced by cationic polymers, diethylaminoethyl-dextran, and protamine were found not to be inhibited by polyanions in agar under the usual overlay conditions. In the case of adenovirus, enhancement by protamine seems to be due to the protamine serving as a source of arginine; enzymes released from the cultured cells digest the protamine and provide a reservoir of arginine for the cells. Other viruses (herpes and echovirus types 3, 4, 5, and 6) known to be susceptible to agar inhibitors were found to be enhanced by cationic polymers even under starch gel and methylcellulose overlays, which are free of polyanions. Since cationic polymers enhance the diffusion of virus through agar or starch gel, plaque enhancement seems to be the result of the gel becoming positively charged so that viruses can move effectively through them. The observation that starch gel and methylcellulose enhance plaque formation with viruses known to be inhibited under agar was also reinvestigated. When the consistency of the agar gel was reduced to the same viscosity of starch gel and methylcellulose overl...Continue Reading


Aug 1, 1967·Proceedings of the Society for Experimental Biology and Medicine·A VaheriS A Plotkin
May 1, 1966·Journal of Bacteriology·C WallisJ L Melnick
Jul 11, 1958·Science·S BARON, R J LOW
Aug 1, 1961·Virology·H LIEBHABER, K K TAKEMOTO
Jan 1, 1961·Advances in Virus Research·P D COOPER
Apr 1, 1962·Proceedings of the Society for Experimental Biology and Medicine·A A TYTELLF J McCARTHY
Jun 1, 1963·Proceedings of the Society for Experimental Biology and Medicine·A A TYTELL, R E NEUMAN
Dec 1, 1963·Proceedings of the Society for Experimental Biology and Medicine·K K TAKEMOTO, P FABISCH
Apr 1, 1964·Proceedings of the Society for Experimental Biology and Medicine·A J NAHMIASP BERNFELD
May 1, 1964·Proceedings of the Society for Experimental Biology and Medicine·K K TAKEMOTO, P FABISCH
Sep 1, 1964·Virology·E DEMAEYER, E SCHONNE

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